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Throttle body/linkage help
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cwat1982
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PostPosted: Fri Jun 11, 2021 8:35 pm    Post subject: Throttle body/linkage help Reply with quote

First off, I’m far from understanding engines… just enjoy tinkering.

Installed taller space saver intakes, and a 1/4” plate reverse mount the throttle bodies so the fuel rail would fit (was hitting the fan shroud). With this the throttle linkage was hitting the generator and couldn’t reach the throttle body for cylinders 1/2. Bent the linkage rod to make it work. Had to flip around the plate off the throttle body for cylinders 3/4 because it was originally set up for push/push linkage, I’m using Scat push/pull linkage. With that has to put some bends in that rod to make it fit.

Image may have been reduced in size. Click image to view fullscreen.

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When I measure the gap between idle screw and throttle travel cylinders 1/2 is 22.5mm, and cylinders 3/4 is 25.2mm. Not sure if this is something I should be concerned with. Here is a side by side of the throttle plates while I move the throttle.


Link

Thanks for any advice!
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Last edited by cwat1982 on Sat Jun 12, 2021 12:04 pm; edited 1 time in total
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Dale M.
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PostPosted: Sat Jun 12, 2021 6:26 am    Post subject: Re: Throttle body/linkage help Reply with quote

With all the bends in linkage there is going to be so much flex I doubt you will get satisfactory operation of linkages/throttle bodies to get a really good tune/performance...

Dale
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cwat1982
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PostPosted: Sat Jun 12, 2021 7:47 am    Post subject: Re: Throttle body/linkage help Reply with quote

Ok thanks Dale, I will try to make a new rod for cylinders 3/4... I think I can make it work with only a couple small bends.

Any thoughts on the difference in throttle travel being an issue? My concern is that I'll be sending more air to cylinders 3/4, not sure if thats anything to be worried about or if the difference is negligible. It's an EFI setup so common throttle position sensor off cylinders 1/2, common 02 sensor, etc.
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67rustavenger Premium Member
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PostPosted: Sat Jun 12, 2021 8:30 am    Post subject: Re: Throttle body/linkage help Reply with quote

Don't know jack about TB injection.
But, can you maybe change the 3-4 throttle shaft lever so it actuates the carb from the bottom side? That should get you some much smoother bends in the tie rods.

Or even better. Do as described above. But extend the throttle shaft levers.
So the tie rods clear the generator and you have a straight line between the center pivot and the throttle shaft plates.

Having Slop in the linkage. Or uneven linkage sync.
Will cause you drivability issues.
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Alstrup
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PostPosted: Sat Jun 12, 2021 9:26 am    Post subject: Re: Throttle body/linkage help Reply with quote

It is a known problem with push-pull systems. Just about all have the same issue. If it absolutely HAS to be that type, the CSP and JDM systems are of the better ones on the market.
But I recommend replacing it with something better.
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PostPosted: Sat Jun 12, 2021 10:47 am    Post subject: Re: Throttle body/linkage help Reply with quote

Maybe try the Sync-Link guy?
https://www.thesamba.com/vw/classifieds/detail.php?id=2169636
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cwat1982
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PostPosted: Sat Jun 12, 2021 10:57 am    Post subject: Re: Throttle body/linkage help Reply with quote

67rustavenger the lever was originally on the bottom for 3/4 but my Scat linkage is push/pull so I had to flip the lever to the top for it all to work. Basically trying to see if this would work vs buying a new push/push linkage.

jeffrey8164 that system looks great and would definitely work, just don't want to drop $300+ on a new linkage... trying any means to make this one work.
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Dale M.
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PostPosted: Sat Jun 12, 2021 12:27 pm    Post subject: Re: Throttle body/linkage help Reply with quote

Maybe the much maligned "Hex Bar" linkage would be better choice...

https://www.cbperformance.com/product-p/6479.htm

Dale
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cwat1982
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PostPosted: Sat Jun 12, 2021 1:48 pm    Post subject: Re: Throttle body/linkage help Reply with quote

That was a painful post for me to read Dale... I actually bought the full CB linkage setup but it wouldn't fit, lower filter plates were hitting the fuel rails and unable to mount.
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PostPosted: Sat Jun 12, 2021 2:55 pm    Post subject: Re: Throttle body/linkage help Reply with quote

Again, I don't know jack about TBI systems.
Curious who/what make of TB's you are running?

Can you rotate the left TB around 180° and move the throttle levers to the rear side of the engine?
In my mind this would make the throttle shafts push, push.

I could of course be wrong on this line of thought.
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sled
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PostPosted: Sat Jun 12, 2021 4:25 pm    Post subject: Re: Throttle body/linkage help Reply with quote

I'm curious why your throttle bodies seem to have been shortened so much?
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Pruneman99
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PostPosted: Sat Jun 12, 2021 4:42 pm    Post subject: Re: Throttle body/linkage help Reply with quote

If you're worried the linkage will flex, weld in a few gussets at the bends.

You can shorten or lengthen the arms on the carbs a bit to even out the opening rates from side to side.
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cwat1982
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PostPosted: Mon Jun 14, 2021 5:44 pm    Post subject: Re: Throttle body/linkage help Reply with quote

67rustavenger they are CB Performance throttle bodies.

Pruneman99 couple great ideas! Thank you!
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Alstrup
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PostPosted: Mon Jun 14, 2021 6:10 pm    Post subject: Re: Throttle body/linkage help Reply with quote

cwat1982 wrote:
67rustavenger they are CB Performance throttle bodies.

Pruneman99 couple great ideas! Thank you!

They look to be cut down to Hobbit length (?) That´s why the Hex bar doesnt fit.
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Dale M.
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PostPosted: Tue Jun 15, 2021 5:40 am    Post subject: Re: Throttle body/linkage help Reply with quote

Alstrup wrote:
cwat1982 wrote:
67rustavenger they are CB Performance throttle bodies.

Pruneman99 couple great ideas! Thank you!

They look to be cut down to Hobbit length (?) That´s why the Hex bar doesnt fit.


Ditto.... The look to be 1/2 the height of standard CB TB's.... How did you come about getting TB's...

Dale
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"Kellison Sand Piper Roadster" For Street & Show.
"Joe Pody Sandrover" Buggy with 2180 for Autocross (Sold)
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